Secretary of Defense Chuck Hagel, left, walks with Saudi Arabian Deputy Minister of Defense Prince Fahd bin Abdullah on April 23 at King Khaled International Airport in Riyadh. Pool photo by Jim Watson

Defense Chuck Hagel, center, is greeted by senior members of the Saudi Arabian armed forces at King Khaled International Airport. Pool photo by Jim Watson

Secretary of Defense Chuck Hagel, left, is served coffee as he meets with Saudi Arabian Deputy Minister of Defense Prince Fahd bin Abdullah in Riyadh. Pool photo by Jim Watson

Secretary of Defense Chuck Hagel waves from the top of the stairs as he boards his aircraft at Ben Gurion Airport near Tel Aviv. Hagel completed a three-day visit to Israel and will now meet with officials in Jordan and Saudi Arabia. Pool photo by Jim Watson

Hagel speaks with a member of a special forces unit. U.S. Embassy via Getty Images